Add parens

Co-authored-by: Dan Halbert <halbert@adafruit.com>

Author: tannewt

ports/zephyr-cp/bindings/zephyr_i2c/I2C.c

@@ -26,7 +26,7 @@
 //|
 //|       Cannot be instantiated directly. Instead singletons are created using the
 //|       ``board`` aliases that match the device tree labels. ``board`` may list multiple
-//|       aliases for a single device. For example, ``board.I2C1`` and ``board.ARDUINO_I2C``
+//|       aliases for a single device. For example, ``board.I2C1()`` and ``board.ARDUINO_I2C()``
 //|       may both refer to the same device.
 //|     """
 //|